<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="todo-list-example">
        <form v-on:submit.prevent="addNewTodo">
            <label for="new-todo">Add a todo</label>
            <input v-model="newTodoText" id="new-todo" placeholder="E.g. Feed the cat">
            <button>Add</button>
        </form>
        <br>
        <ul>
            <li is="todo-item" v-for="(todo, index) in todos" v-bind:key="todo.id" v-bind:title="todo.title"
                v-on:remove="todos.splice(index, 1)"></li>
        </ul>
        <br>
        <todo-item v-for="(todo, index) in todos" v-bind:key="todo.id" v-bind:title="todo.title"
            v-on:remove="todos.splice(index, 1)">
            <todo-item>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
        Vue.component('todo-item', {
            template: '\
    <li>\
      {{ title }}\
      <button v-on:click="$emit(\'remove\')">Remove</button>\
    </li>\
  ',
            props: ['title']
        })

        new Vue({
            el: '#todo-list-example',
            data: {
                newTodoText: '',
                todos: [
                    {
                        id: 1,
                        title: 'Do the dishes',
                    },
                    {
                        id: 2,
                        title: 'Take out the trash',
                    },
                    {
                        id: 3,
                        title: 'Mow the lawn'
                    }
                ],
                nextTodoId: 4
            },
            methods: {
                addNewTodo: function () {
                    this.todos.push({
                        id: this.nextTodoId++,
                        title: this.newTodoText
                    })
                    this.newTodoText = ''
                }
            }
        })
    </script>
</body>

</html>